CLAS physics database search results Measurement E18M35 E89-004 R. A. Schumacher 2005 cos(theta) Cx Data errors dimensionless dimensionless dimensionless -0.75 0.534 0.796 -0.55 0.064 1.182 -0.35 0.105 0.713 -0.15 -0.289 0.442 0.05 -0.549 0.717 0.25 0.071 0.402 0.45 -0.083 0.233 0.65 -0.474 0.213 0.85 -0.449 0.212